Chuck for torsional stresses



1368- 19 F. A. AUGENTHALER 1,783,870

CHUCK FOR TORSIONAL STRESSES Filed Oct. 16, 1928 872 venfor Patented D elc. 2, 1930 r I r s I r [UNITED STATES PATENT OFF-ICE v v a riunnmon iiNToN imesmmmam BERLIN, eaannnv" a l I oHUeK ronronsroimr. s'rnnssns l i Application filed Qctober 16, 1928, Serial No. 212,883, and in erma l Deoeml ier 1927.

This invention hasreference to improvesolutely exact" adjustment of the I boring, ments in chucks for rotating tools," and in par chuck or the like. i J ticular to safety-coupling andconnecting In the accompanying 'drawingz V Y means to be employed with such tools and in- Figure 1 represents a view of a segment, {tended for the purpose oftransmitting rotatpartlyin section and partly in elevation, of

ing strains an'djtorques occurring by the opa frictional coupling or chuckembodying my eration of the working shafts of such tools, as V invention, the parts being disposed in one exfor instance thread outters, drill borers and treme' position; and I the like, to the tools themselves or to other Figure 2, a View similar to Fig. l with the losmoving parts of machinery. Fastening colparts disposed in their other extreme posilets and chuckshave been disclosed by the tion.

previous art in which the positioning of the The invention will be more particularly tools is controlled by hand, and it has also described with reference to the accompanybeen suggested to employ clamping jaws ing'dra-wing showing by 'way'of eXemplifi-V 15 which are forced against the tools'bymeans cation the frictional coupling embodying the of a series of balls and of twoconical 'operatprinciplesofmy invention in vertical longi- 7 ing surfaces. With these previous suggestudinalsec'tion and in two different positions. tionsfthere is however the difficulty that they The driving spindle l jshow n-in the drawing will only, operate satisfactorily with tools carries a flange QprOjectinginto the outer 20 working in one single direction only. Nor is casing. Upon' this flange an annular disc 3 it possible by means of the instrumentalities of elastic or resilient material, such as for referred to tosecurely and undispla ceably instance Vulcan-fibre is supported'and adaptadjust and lock the clamping chuckfor colleted for the transmission ofthe different to a nicety for 'a 'previously"determined torquesorrota ry strains of the driving spin- 25 torque or torsional strain in both directions: dle 1; Anotherlring shaped disc 4 serving Hi.v Instead of becoming delicately adjustedthe the same purpose is disposed beneath the tool,-when secured by the chucks as heretofiange2. In accordance with myinvention fore employed and suggested, will bind and aniannular ballrace 5 is mounted upon the is liable to vbe clampedthe more tightly the upper;disc 5, the balls 14 being arranged inso'greater the strain to which it isex'posed, so the conical journal or pocket of the race v5. 80. that with the previous arrangements there Asa fclosureforthe pocket a steel-ring j fi is was practically no reliable protection against" provided which absorbs the pressure of the rupture of tools.' a Y l f y f balls in theadjus'tment ofthe frictional cou- "Nowin accordance with this invention an" pling. The lower-frictional ring 4 rests di- 35 exact and delicate adjustment of the clamprectly upon the boring-chuck-7, and bythe ing means in'both'directionsof'rotation is friction caused-thereby it"transmits the roaccomplished'by theuse of a frictionalcow. taryfor, torsional 'strainofthe driving shaft pling in which theopposed bearingsurfaces l'upon. the boring chuckf'l, Asa closing for the series of balls are provided with conimeans for the entirefcou-pling acheck-nut 8is 40 cal surfaces of difi e ent configuration 'or inprovided which is screwed onto' the chuck "7 clinationi- By this. means it becomes 1 posby the threadsi9. {The nut is' provided .in'its sible to force the balls outwa'rdlyin a' strictupper portion110' withthe interior threads-11 ly radial direction to 'causerelative moveengaging with the screw threadsof' an adment in anaxial directionbetween said conijusting ring 12 terminating at itslower'end s 45 cal bearing surfaces, so that the driving spinin a conical surface 13 adapted-tobear upon dle or shaft may be tightly pressed against the balls I a the boring chuck or the like. In view of'the V The conical surface '13 ofwthe adjusting factthat theiballsare engaging the conical ring 12 will extendat .a different angle to bearing surfaceof the ball-race in tangential the axis of the chuck than the opposed an- I 5 points only there is no necessity for an abnularfconica'l surface of the ball race5, and 16.0,-

against the boring chuck The operation of the device is substantial ly as follows :By screwing the adjusting ring 12 into the threaded part 11 the conical surface 18 of the ring will force the balls 14: outwards in the radial direction, so that by means of the: ball race 5 the flange 2 of the driving spindle orshaft 1 is pushed V 7. The pressure of the frictional coupling produced by this movement depends merely upon the relative depth of adjustment of the conical surface 13. Inasmuch as the balls 14: are engaging their conical bearing surfaces in tangential.

points only, the pressure required for the adjustment of the frictional coupling is very low and may easily be accurately ad usted V by manipulating the adjusting ring 12, while the action produced upon the driving spindle 1 is comparatively very considerable: The.

new kind of coupling means may be employedin connection with machine tools of different kinds, and in connection withdrivting instrumentalities,as for instance with trains of operating gears and the like.

It will have to be understood that vari ous modifications may be made in the construction shown within the principle and vscope of this invention, as defined by the ap pended claims.

I claim 1. A casing, two rotatable parts held in operative relation and in-axial alignmentby said casing, and frictional meansinterposedbetween said rotatable parts, in combination withbearing balls, a ball race arranged insaid casing concentric with the axes of saidarotatable parts and havingan annu lar conical surface engaged bysaid balls, and an adjusting member havingan annular conical surface concentric with said ball race and engaging said balls, the conical faces of said adjusting member and of said ball race extending at, different angles with relation-to their common axis.

2. A; driving member, a driven m'ember,

means for maintaining said members in axial alignment, and a yielding friction element interposed between said members tobe en-= gaged and compressed by the opposingfaces thereof, in combination with-bearing balls, a ballrace dlsposed in said means concentric wlth the. common axis of said members, said ball race-having an annular conical bearing v surface for said balls, and an adjusting ring having a conical bearing surface disposed concentrically with relation to, and in opposition to, said ball race, said conical bearing surface of said adjusting ring extending at a different angle with relation to its axis thanthe opposed conical face of said ball .race.

3. A driving member, a driven member, means for maintaining said members in axial alignment, and a yielding friction element interposed between said members to beenga-ged and-compressed by the opposing faces thereof, in combination with bearing balls, a ball race disposed in'said means concentric with the commonaxis of said members, said ballracehavingan:annular conical bearing surface rapsaid,ba11 a yieldaible: friction element interposed between said ball race and'one of said members, and an. adjusting ring havinga conicalbearing surface disposedconcentrically with-relation to said ball race and engaging .said balls, said .con ical bearing surface of, said adjusting ring extending ,at a difierentl angle with relation to its axis than thevopposed conicalface of said ball race.-

4.1L chuck comprising; a casing, bearing balls disposedthereima ball racedisposed in said casing for displacement in an axialdirection thereof and arranged concentric withthe axis thereof andhaving an-annular conical bearing 'surface for said balls, in combination with an adjusting ring .proj ecting into said:casing concentric withisaid ball race and having a conicalbearingsurface presentedain oppositionito'the 'bearingrsurs face of ,saidriball' race :and engaging :said

balls-, said conicalbearing surface of said ring extendingati a different angle: with relationto its axis thanithe corresponding angle of said bearing; sur faceof, saidaball race. 7

5. A -chuek -comprising, a casing, bear-ing; balls disposed therein,-,=a -ball .race disposed in said casing-for displacement in an-axial direction thereof 1 and arranged concentric with the axis thereof and having an annular conical bearing surface, for said balls, in

3 combination with adjusting imeans sprojecting in saidcasing andcausinggmovement of? said balls 111 a IELdlELlwdlIQClSlOIl. m'rcontact w1th-sa1d ball race, whereby the-latter is 1 caused to moveini an axial direction.

Intestimonywvhereof, I ;have signed my name to this specification atuBerlin this 28th 7 day of September, 1928.

FRIEDRICH ANTON AUGENTHALER. 

